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    Wyświetlanie 1-9 z 9
    Tytuł:
    Magnetotransport measurements as a tool for searching 3D topological insulators
    Autorzy:
    Śliż, Paweł
    Sankowska, Iwona
    Bobko, Ewa
    Szeregij, Eugeniusz
    Grendysa, Jakub
    Tomaka, Grzegorz
    Żak, Dariusz
    Płoch, Dariusz
    Jasik, Agata
    Powiązania:
    https://bibliotekanauki.pl/articles/2052167.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    materials science
    magnetotransport
    topological insulators
    quantum Hall effect
    Opis:
    The paper covers some measurement aspects of transport of electrons through metals and semiconductors in magnetic field - magnetotransport - allowing for the determination of electrical parameters characteristic of three-dimensional (3D) topological insulators (TI) (i.e. those that behave like an insulator inside their volume and have a conductive layer on their surface). A characteristic feature of the 3D TI is also a lack of differences between the chemical composition of the conductive surface and the interior of the material tested and the fact that the electron states for its surface conductivity are topologically protected. In particular, the methods of generating strong magnetic fields, obtaining low temperatures, creating electrical contacts with appropriate geometry were presented, and the measurement methods were reviewed. In addition, the results of magnetotransport measurements obtained for two volumetric samples based on the HgCdTe compound grown with the molecular beam epitaxy method are presented.
    Źródło:
    Metrology and Measurement Systems; 2021, 28, 4; 725-734
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Quantum Filtering Equation for System Driven by Field in a Mixture of Vacuum and Coherent State
    Autorzy:
    Dąbrowska, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1032426.pdf
    Data publikacji:
    2017-07
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    quantum measurements
    quantum filtration
    quantum stochastic calculus of Itô type
    Opis:
    We consider the problem of optimal estimation of a state of a quantum system interacting with the Bose field being in a mixture of the vacuum and coherent state. The system and electromagnetic field are described by making use of quantum stochastic unitary evolution. We derive stochastic master equation using Gardiner and Collet's input-output theory and the concept of cascade systems. To find the stochastic evolution of the system conditioned on the result of the quadrature measurement of the output field, we extend the compound system by an ancilla driven by the vacuum and generating the desired non-classical state of light.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 1; 112-114
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Single-Mode-Fiber-Based Mach-Zehnder Interferometer Setup for Correlation Measurements for Single CdTe/ZnTe Quantum Dots
    Autorzy:
    Rodek, A.
    Kazimierczuk, T.
    Starzyk, P.
    Kossacki, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/1033853.pdf
    Data publikacji:
    2017-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    II-VI
    quantum dots
    two-photon interference
    single-mode fiber
    CdTe/ZnTe
    Opis:
    We report on design and construction of a single-mode-fiber-based Mach-Zehnder interferometer system for measuring single photon indistinguishability from quantum dots emitting in visible spectrum (630±50 nm). The performance of the instrument was tested for its efficiency and usability in single-photon correlation measurements in a proposed experimental setup.
    Źródło:
    Acta Physica Polonica A; 2017, 132, 2; 379-382
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Entanglement Detection by Current Measurements in Double Quantum Dot System
    Autorzy:
    Busz, P.
    Rożek, P.
    Tomaszewski, D.
    Martinek, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/1386781.pdf
    Data publikacji:
    2015-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    03.67.Mn
    03.67.Bg
    73.23.-b
    Opis:
    The development of quantum computing in quantum dots systems requires highly efficient and continuous solid-state source of spatially separated spin-entangled electrons. One of the approaches is a use of double quantum dot system connected to superconducting lead, where Cooper pairs provide a source of naturally entangled electrons. Apart from the source, an useful tool for detection of quantum entanglement is needed. We present entanglement detection by the ferromagnetic electrodes using entanglement witness operator method and direct measurement of spin polarized current in the system. We investigate requirements that have to be fulfilled by ferromagnetic detectors.
    Źródło:
    Acta Physica Polonica A; 2015, 127, 2; 490-492
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some quantum limits for scaling of electronic devices - estimations and measurements
    Autorzy:
    Nawrocki, W.
    Shukrinov, Y. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/221751.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    nanostructure
    quantum effect
    integrated circuits
    Opis:
    In this paper we discuss some physical limits for scaling of transistors and conducting paths inside of semiconductor integrated circuits (ICs). Since 40 years only a semiconductor technology, mostly the CMOS and the TTL technologies, are used for fabrication of integrated circuits on an industrial scale. Miniaturization of electronic devices in integrated circuits has technological limits and physical limits as well. In 2010 best parameters of commercial ICs shown the Intel Core i5-670 processor manufactured in the technology of 32 nm. Its clock frequency in turbo mode is 3.73 GHz. A forecast of the development of the semiconductor industry (ITRS 2011) predicts that sizes of electronic devices in ICs circuits will be smaller than 10 nm in the next 10 years. At least 5 physical effects should be taken into account if we discuss limits of scaling of integrated circuits.
    Źródło:
    Metrology and Measurement Systems; 2012, 19, 3; 481-488
    0860-8229
    Pojawia się w:
    Metrology and Measurement Systems
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Pomiary właściwości elektrycznych nanokompozytów (CoFeZr)x + (Al2O3)1-x
    The measurements of the electrical properties of (CoFeZr)x + (Al2O3)1-x nanocomposites
    Autorzy:
    Kołtunowicz, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/152236.pdf
    Data publikacji:
    2007
    Wydawca:
    Stowarzyszenie Inżynierów i Techników Mechaników Polskich
    Tematy:
    nanokompozyty
    przewodność skokowa
    studnie kwantowe
    rezystancja
    nanocomposites
    hopping recharging
    quantum wells
    resistance
    Opis:
    W pracy przedstawiono wyniki pomiarów właściwości elektrycznych nanokompozytów (CoFeZr)x + (Al2O3)1-x w oparciu o prąd przemienny o częstotliwości z zakresu od 50 Hz do 1 MHz. Pomiary wykonano w zakresie temperatur od 77 K do 373 K. Przeprowadzono analizę uzyskanych wyników i zaproponowano sposób przenoszenia ładunków elektrycznych pomiędzy studniami kwantowymi.
    The paper presents the results of the measurements of the electrical properties of (CoFeZr)x + (Al2O3)1-x nanocomposites performed on the alternating current in the frequency range from 50 Hz to 1 MHz. The measurements were done in the temperature range from 77 K to 373 K. The analysis of the results were performed and the mechanism of the carrying electric charges between quantum wells was proposed.
    Źródło:
    Pomiary Automatyka Kontrola; 2007, R. 53, nr 11, 11; 44-46
    0032-4140
    Pojawia się w:
    Pomiary Automatyka Kontrola
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Strzałka czasu a niektóre interpretacje mechaniki kwantowej
    Time Arrow and Some Interpretations Of Quantum Mechanics
    Autorzy:
    Łagosz, Marek
    Powiązania:
    https://bibliotekanauki.pl/articles/2013391.pdf
    Data publikacji:
    2006
    Wydawca:
    Katolicki Uniwersytet Lubelski Jana Pawła II. Towarzystwo Naukowe KUL
    Tematy:
    strzałka czasu
    EPR-eksperyment
    równanie Schrödingera
    (a)symetria czasowa
    niezmienniczość względem odwrócenia czasu
    pomiar kwantowy
    parametry ukryte
    time arrow
    EPR-experiment
    Schrödinger’s equation
    time (a)symetry
    time- reversal invariance
    quantal measurements
    “hidden variables”
    Opis:
    In the paper I discuss some premises of “quantum mechanics” with regard to the thesis that the time arrow does (not) exist. In this context I consider above all the famous Einstein-Podolsky-Rosen’s experiment (EPR-experiment). I also indicate Schrödinger’s interpretation of wave function “symmetrical” towards time (nomological isotropy) and the peculiar understanding of the pair particle-antiparticle, assuming that the direction of time can be reversed. Eventually, I discuss the issue of measurement in quantum mechanics with which the existence of time arrow (anisotropy) is often linked. If it comes to the interpretations of quantum mechanics, from the point of which I consider the issues in question, then in principle I limit myself to two: the so-called Copenhagen interpretation and David Bohm’s conception of “hidden parameters.” I arrive at a conclusion that the premises of quantum mechanics that are at issue here cannot be sufficient grounds for a conclusive recognition of the reversibility (non-existence) of time arrow.
    Źródło:
    Roczniki Filozoficzne; 2006, 54, 2; 391-411
    0035-7685
    Pojawia się w:
    Roczniki Filozoficzne
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Photoreflectance Measurements of InGaAs/GaAs Quantum Wells
    Autorzy:
    Tomaszewicz, T.
    Korona, K. P.
    Bożek, R.
    Baranowski, J. M.
    Powiązania:
    https://bibliotekanauki.pl/articles/1952324.pdf
    Data publikacji:
    1996-11
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    68.55.Bd
    73.20.Dx
    78.66.Fd
    Opis:
    Samples with InGaAs/GaAs quantum wells were grown by metallo-organic chemical vapour deposition in order to detect and analyze GaSb islands deposited on the surface. Results of photoreflectance measurements of quantum wells are reported. The correspondence between broadening of quantum well transition lines and GaSb structures has been observed.
    Źródło:
    Acta Physica Polonica A; 1996, 90, 5; 965-968
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The theorems of Koenig and Birkhoff and their connection with the minimization of the duration time of the measurements of automatic telecommunication channels
    Autorzy:
    Perz, Szczepan
    Zaremba, Leszek
    Powiązania:
    https://bibliotekanauki.pl/articles/748569.pdf
    Data publikacji:
    1982
    Wydawca:
    Polskie Towarzystwo Matematyczne
    Tematy:
    Channel models (including quantum), Discrete-time control systems, Hypergraphs, Matrix equations and identities, Matrices of integers, Stochastic matrices
    Opis:
    .
    A problem (P) of minimization of the duration time of the measurements of automatic telecommunication channels is considered. P is a discrete optimization problem solved by graph theory methods. It is defined by (i)-(v), where: (i) for each i, 1≤i≤p, and j, 1≤1≤p, there are given k ij channels to be measured between node ”i” and node ”j”; (ii) measurement of one channel lasts one unit; (iii) there are exactly two devices, say A, B, in each node (the case where there is an arbitrary number of devices A, B in each node may be easily reduced to this case); (iv) the channel between node ”i” and node ”j” may be measured only by use of device A being present in node ”i” and device B in node ”j”; (v) in each time both devices A or B may measure only one channel. To solve P, some knowledge of hypergraphs as well as functional analysis (the Krein-Milman theorem) and linear algebra (the Koenig theorem) is necessary. The Koenig theorem is proved in a simple manner similarly as the dual Koenig theorem (which is a new result). As corollaries the Birkhoff theorem about bistochastic matrices and the dual Birkhoff theorem are deduced.
    Źródło:
    Mathematica Applicanda; 1982, 10, 19
    1730-2668
    2299-4009
    Pojawia się w:
    Mathematica Applicanda
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-9 z 9

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